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Derivative Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
Derivative Financial Instruments  
Components of gain (loss) on derivatives, net

 

 

 
  Year Ended December 31,  
 
  2012   2011   2010  
 
  (in thousands)
 

Realized gain (loss) on other derivative agreements

  $ (137,565 ) $ (7,182 ) $ 721  

Unrealized gain (loss) on other derivative agreements

    (148,027 )   85,262     (2,196 )

Realized gain (loss) on interest rate swap agreements

            (2,860 )

Unrealized gain (loss) on interest rate swap agreements

            2,830  
               

Total gain (loss) on derivatives, net

  $ (285,592 ) $ 78,080   $ (1,505 )